243121240554 has 32 divisors (see below), whose sum is σ = 521491452480. Its totient is φ = 75326539392.

The previous prime is 243121240517. The next prime is 243121240561. The reversal of 243121240554 is 455042121342.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20113227 + ... + 20125310.

It is an arithmetic number, because the mean of its divisors is an integer number (16296607890).

Almost surely, 2^243121240554 is an apocalyptic number.

243121240554 is an abundant number, since it is smaller than the sum of its proper divisors (278370211926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243121240554 is a wasteful number, since it uses less digits than its factorization.

243121240554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40238614.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 243121240554 its reverse (455042121342), we get a palindrome (698163361896).

The spelling of 243121240554 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, five hundred fifty-four".